package com.blog.util;

public class PageUtil {
	public static String genPagination(String targetUrl, long totalNum, int currentPage, int pageSize, String param) {
		long totalPage = totalNum % pageSize == 0L ? totalNum / pageSize : totalNum / pageSize + 1L;
		if (totalPage == 0L) {
			return "未查询到数据";
		}
		StringBuffer pageCode = new StringBuffer();
		pageCode.append("<li><a href='" + targetUrl + "?page=1&" + param + "'>首页</a></li>");
		if (currentPage > 1) {
			pageCode.append(
					"<li><a href='" + targetUrl + "?page=" + (currentPage - 1) + "&" + param + "'>上一页</a></li>");
		} else {
			pageCode.append("<li class='disabled'><a href='#'>上一页</a></li>");
		}
		for (int i = currentPage - 2; i <= currentPage + 2; i++) {
			if ((i >= 1) && (i <= totalPage)) {
				if (i == currentPage) {
					pageCode.append("<li class='active'><a href='" + targetUrl + "?page=" + i + "&" + param + "'>" + i
							+ "</a></li>");
				} else {
					pageCode.append("<li><a href='" + targetUrl + "?page=" + i + "&" + param + "'>" + i + "</a></li>");
				}
			}
		}
		if (currentPage < totalPage) {
			pageCode.append(
					"<li><a href='" + targetUrl + "?page=" + (currentPage + 1) + "&" + param + "'>下一页</a></li>");
		} else {
			pageCode.append("<li class='disabled'><a href='#'>下一页</a></li>");
		}
		pageCode.append("<li><a href='" + targetUrl + "?page=" + totalPage + "&" + param + "'>尾页</a></li>");
		return pageCode.toString();
	}
}
